[go: up one dir, main page]

WO2004090856A1 - Procede pour ajuster un dispositif d'affichage et dispositif d'affichage - Google Patents

Procede pour ajuster un dispositif d'affichage et dispositif d'affichage Download PDF

Info

Publication number
WO2004090856A1
WO2004090856A1 PCT/JP2004/004291 JP2004004291W WO2004090856A1 WO 2004090856 A1 WO2004090856 A1 WO 2004090856A1 JP 2004004291 W JP2004004291 W JP 2004004291W WO 2004090856 A1 WO2004090856 A1 WO 2004090856A1
Authority
WO
WIPO (PCT)
Prior art keywords
duty ratio
led
color
color led
display device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2004/004291
Other languages
English (en)
Japanese (ja)
Inventor
Yutaka Ozaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HUNET Inc
Original Assignee
HUNET Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HUNET Inc filed Critical HUNET Inc
Priority to EP04723725A priority Critical patent/EP1562170B1/fr
Priority to US10/532,240 priority patent/US20060152468A1/en
Priority to DE602004017832T priority patent/DE602004017832D1/de
Publication of WO2004090856A1 publication Critical patent/WO2004090856A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0235—Field-sequential colour display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant

Definitions

  • the present invention particularly relates to a method of adjusting a display device having LEDs (Light Emitting Diodes) of three primary colors of R, G, and B, and a display device.
  • LEDs Light Emitting Diodes
  • a liquid crystal display device using LEDs of three primary colors of R (red), G (green), and B (blue), for example, a field sequential system (hereinafter referred to as JP-A-2000-241811) has been proposed.
  • JP-A-2000-241811 a field sequential system
  • the FS type liquid crystal display device has three color LEDs on the back of the liquid crystal shutter, sequentially turns on the LEDs of each color at high speed, and opens and closes the liquid crystal shutter at each pixel position so as to synchronize with this, so that each pixel position is Can display the desired color.
  • the LCD shutter when displaying red, the LCD shutter is opened during the period when the red LED is emitting light, and then the LCD shutter is opened during the period when the green LED is emitting and the period when the blue LED is emitting. Close operation.
  • the LCD shutter is opened only while the LED of that color is emitting light, and the LCD shutter is closed while the other LEDs are emitting light.
  • Y yellow
  • M magenta
  • C cyan
  • a main object of the present invention is to provide a display device adjustment method and a display device that can easily perform white balance adjustment even when the LED emission characteristics vary.
  • a further object of the present invention is to reduce the current consumption when such white balance adjustment is performed.
  • FIG. 1 is a block diagram showing a configuration of an LED driving device according to an embodiment
  • Figure 2 shows the minimum voltage value required to obtain the desired brightness for each color LED
  • FIG. 3 is a block diagram showing a configuration of a drive voltage setting device according to the embodiment
  • FIG. 4 is a flowchart for explaining a process of setting an applied voltage and a duty ratio by the drive voltage setting device
  • FIG. 5 is a flowchart for explaining a setting process of a duty ratio for obtaining a desired white balance
  • FIG. 6 is a chromaticity space diagram for explaining a setting process of a duty ratio for obtaining a desired white balance
  • FIG. 7 is a waveform chart for explaining the operation of the LED drive device. BEST MODE FOR CARRYING OUT THE INVENTION
  • reference numeral 10 denotes an LED drive device as a whole.
  • the LED drive device 10 is provided in the liquid crystal display device, and drives R, G, and G three-color LEDs disposed on the back of the liquid crystal panel.
  • R, G, and G three-color LEDs disposed on the back of the liquid crystal panel.
  • the LED driving device 10 has an applied voltage storage register 11 for R (red), an applied voltage storage register 12 for G (green), and an applied voltage storage register 13 for B (blue). These registers 11, 12, and 13 store voltage values to be applied to the R, G, and B LEDs, respectively.
  • a bus 14 for setting the stored value is connected to each of the registers 11, 12 and 13.
  • the application voltage value for each color LED is stored in 13.
  • the applied voltage value for each color LED output from each of the registers 11, 12, and 13 is input to the register selection circuit 15.
  • the red LED light emission timing signal TR, the green LED light emission timing signal TG, and the blue LED light emission timing signal TB are input to the register selection circuit 15, and based on the light emission timing signals, the applied voltage values of R, G, and B are determined. Select one of them and output.
  • the applied voltage stored in the R applied voltage storage register 11 Select and output a value.
  • the field sequential display is performed. For example, if the field frequency is 65 Hz, the LEDs of each color sequentially emit light at a frequency of 195 Hz, which is three times that of the field frequency. That is, the register selection circuit 15 sequentially selects and outputs the voltage values stored in the R applied voltage storage register 11, the G applied voltage storage register 12, and the B applied voltage storage register 13 at an interval of about 5 ms. Power.
  • the applied voltage value selected by the register selection circuit 15 is converted to an analog value by a digital-to-analog (DA) conversion circuit 17 of the applied voltage forming unit 16 and then sent to a voltage variable circuit 18.
  • the voltage variable circuit 18 converts the voltage generated by the power supply voltage generation circuit 19 into a voltage corresponding to the analog value input from the digital-to-analog conversion circuit 17, and then supplies the voltage to the LED unit 20.
  • the LED driving device 10 has the registers 11, 12, and 13 in which the voltage values to be applied to the respective LEDs are stored, and the voltage generated by the power supply voltage generation circuit 19 is stored in the register 11. It is converted to the value stored in, 12, 13 and then supplied to the LED. As a result, power consumption can be reduced as compared with the case where the same voltage is applied to each color LED.
  • Fig. 2 shows the minimum applied voltage (hereinafter referred to as the minimum emission voltage) required to obtain the desired luminance in each color LED.
  • the minimum emission voltage of the green LED and the blue LED is almost the same, but the minimum emission voltage of the red LED is The emission voltage is lower than their minimum emission voltage.
  • the applied voltage storage registers 11, 12, and 13 of the LED drive device 10 store the minimum emission voltage value of each color LED.
  • the stored minimum emission voltage value is actually lower for the red LED than for the green and blue LEDs. In other words, the required minimum voltage can be applied to each color LED, so that the current consumption can be reduced.
  • the minimum emission voltage also varies for each color LED.
  • red LEDs vary between 1.75V and 2.45V
  • green and blue LEDs vary between 2.9V and 3.9V. This variation in the minimum light emission voltage is due to product-specific variations due to LED manufacturing.
  • the applied voltage to the red LED is made smaller than the applied voltage to the green and blue LEDs, but also the applied voltage in consideration of the variation of the minimum emission voltage between individual products.
  • Registers 11, 12, and 13 As a result, it is possible to obtain desired luminance with each color LED while reducing power consumption.
  • the application of the applied voltage values to the respective color registers 11, 12, and 13 is performed via the stored value setting bus 14, which will be described later.
  • the LED driving device 10 has an R duty ratio storage register 21, a G duty ratio storage register 22, and a B duty ratio storage register 23. These registers 21, 22, and 23 store duty ratio data of a PWM signal for PWM control of the R, G, and B LEDs, respectively. Each of the registers 21, 22, and 23 is connected to a stored value setting bus 14.When the LED driver 10 is shipped from the factory, the LEDs 21, 22, and 23 are connected to the registers 21, 22, and 23 via the stored value setting bus 14. Duty ratio data is stored. The duty ratio data for each color LED output from each of the registers 21, 22, and 23 is sent to the PWM waveform forming circuits 24, 25, and 26, respectively. Each of the PWM waveform forming circuits 24, 25 and 26 forms a PWM waveform according to the duty data in synchronization with the clock signal CLK.
  • the waveform forming circuits 24, 25 and 26 convert the PWM waveform based on the red LED emission timing signal TR, green LED emission timing signal TG and blue LED emission timing signal TB to the base of transistors 27, 28 and 29. Output to The output terminals of the R, G, and B LEDs are connected to the collectors of the transistors 27, 28, and 29, respectively, and the emitters are grounded.
  • the red LED emission timing signal TR has a logical value of “1”, and only the P WM waveform forming circuit 24 corresponding to the red LED outputs the P WM signal.
  • the current corresponding to the signal flows to the red LED, and the red LED emits light.
  • the ED emission timing signal TG becomes a logical value “1” during the green LED emission period, and the PWM signal is output only from the PWM waveform forming circuit 25 corresponding to the green LED. Current flows through the green LED, and the green LED emits light.
  • FIG. 3 shows the configuration of the drive voltage setting device 30 that sets the voltage values stored in the applied voltage storage registers 11, 12, and 13 for each color.
  • the driving voltage setting device 30 stores the duty ratio data for each color LED stored in the duty ratio storage registers 21, 22, and 23 in addition to the voltage values for each color LED stored in the applied voltage storage registers 11, 12, and 13. Is also obtained.
  • the drive voltage setting device 30 has a luminance / chromaticity meter 31 for measuring the luminance and chromaticity of light transmitted from the LCD panel.
  • the light emitted from the LED unit 20 is transmitted to a luminance and chromaticity meter 31 via a light guide plate (not shown) and an LCD panel 40.
  • the LCD panel 40 is driven to open and close by applying a predetermined voltage at a predetermined timing from an LCD driving circuit (not shown) to the liquid crystal at each pixel position to pass or block light emitted from the LED. ing. It is assumed that the LED unit 20, the light guide plate, and the LCD panel 40 are assembled in the same manner as when the product was shipped.
  • the luminance and chromaticity data obtained by the luminance / chromaticity meter 31 are sent to a microcomputer (microcomputer) 32.
  • the drive voltage setting device 30 has an applied voltage value setting unit 33 and a duty ratio setting unit 34, and the voltage value set by the applied voltage value setting unit 33 is applied to the DA conversion circuit 17 of the LED driving device 10.
  • the duty ratio data set by the duty ratio setting unit 34 is sent to the PWM waveform forming circuits 24, 25, 26.
  • the set voltage value and the set duty ratio are specified by the microcomputer 32. In other words, the microcomputer recognizes the set voltage value and duty ratio.
  • the microcomputer 32 determines whether or not the luminance and chromaticity satisfy predetermined preset values, and when the desired values are satisfied, sets the voltage value and the duty ratio applied at that time to a stored value.
  • the data are written to the applied voltage storage registers 11, 12, and 13 and the duty ratio storage registers 21, 22, and 23 via the bus 14. That is, the microcomputer 32 has a function as means for writing stored data to the applied voltage storage registers 11, 12, 13 and the duty ratio storage registers 21, 22, 23.
  • the driving voltage setting device 30 records the applied voltage value (minimum emission voltage) to the applied voltage storage registers 11, 12, and 13 for each color and stores the duty ratio storage registers 21, 22, and 23.
  • the recording process of the duty ratio data will be described in detail.
  • the drive voltage setting device 30 sets the duty ratio in the duty ratio setting unit 34 in the following step ST11.
  • the process is to set the applied voltage to the red LED. Set the duty ratio to the maximum, and set the on duty ratio of the green and blue LEDs to 0. That is, the data with the largest on-duty ratio is given to the PWM waveform forming circuit 24, and? ⁇ 1 Data with an on-duty ratio of 0 is supplied to the waveform forming circuits 25 and 26.
  • the microcomputer 32 sets the target luminance. .
  • step ST13 the applied voltage value setting section 33 sets the minimum applied voltage value Vmin (for example, 1.5 V), and the voltage variable circuit 18 uses the voltage generated by the power supply voltage generating circuit 19 as the set voltage. And apply it to the LED unit 20.
  • Vmin for example, 1.5 V
  • the microcomputer 32 determines whether or not the measured luminance obtained by the luminance 'chromaticity meter 31 is larger than the target luminance. If the measured luminance is lower than the target luminance, the process proceeds to step ST15 to apply the applied voltage.
  • the applied voltage set by the value setting unit 33 is increased by k (for example, 0.4), and the determination is made in step ST14. If a positive result is obtained in step ST14, this means that the minimum necessary voltage for obtaining the desired luminance is currently applied to the red LED.
  • the microcomputer 32 writes the voltage value currently set by the applied voltage value setting unit 33 to the R applied voltage storage register 11. In this way, the minimum emission voltage value for the red LED to obtain a desired luminance is stored in the R applied voltage storage register 11.
  • step ST17 the microcomputer 32 determines whether or not the measured brightness matches the target brightness. If not, the process proceeds to step ST18, where the on-duty ratio set in the duty ratio setting unit 32 is changed. Reduce by r and return to step ST17.
  • step ST17 If a positive result is obtained in step ST17, this means that the red LED can be illuminated at the desired luminance by the PWM signal having the duty ratio currently set in the duty ratio setting unit 34. 9 Then, the microcomputer 32 writes the voltage value currently set in the duty ratio setting unit 34 to the R applied voltage storage register 11. In this way, the duty ratio storage register 11 stores the duty ratio data for the red LED to obtain the desired luminance.
  • the processing in steps ST17 to ST19 is, in other words, after setting the minimum applied voltage capable of obtaining the target luminance in steps ST14 to ST16, the detailed luminance control is performed by the PWM signal. It can be said that the duty ratio is set so as to approach the target luminance.
  • the drive voltage setting device 30 ends the data write processing to the R applied voltage storage register 11 and the R duty ratio storage register 21 in the following step ST20.
  • step ST31 the applied voltage stored in the applied voltage storage registers 11, 12, and 13 and the duty ratio storage register 21, The LEDs of each color are sequentially illuminated by the PWM signal of the on-duty ratio stored in 22, 23, and the LCD panel 40 is driven by an LCD drive circuit (not shown).
  • the LED driving device 1 ⁇ sequentially applies the LED voltages for the respective colors stored in the applied voltage storage registers 11, 12, and 13 to the LED unit 20, and synchronizes with the? 1 ⁇ ] ⁇ 4
  • the waveform forming circuits 24, 25, 26 form the PWM signals for each color LED according to the duty ratio stored in the duty ratio storage registers 21, 22, 23.
  • step ST31 the actual field-sequential LE D drive and LCD drive are performed.
  • the data stored in the applied voltage registers 11, 12, 13, and the duty ratio storage registers 21, 22, 23 are data set as shown in FIG.
  • step ST32 the chromaticity of the display color is measured by the luminance / chromaticity meter 31.
  • the microcomputer 32 calculates the difference between the measured chromaticity and the target value of the white balance, corrects the duty ratio set in the duty ratio setting section 34 according to the difference, and sets the PWM for each color. It is supplied to the waveform forming circuits 24, 25, 26.
  • the microcomputer 32 can read the duty ratio for each color stored in the duty ratio storage registers 21, 22, and 23, and read the read duty ratio for each color and the measurement color.
  • the duty ratio for each color, which is set in the duty ratio setting section 34 is specified from the difference between the degree and the target value of the white balance. In this way, the duty ratio for each color is set to a value at which the target white balance can be obtained.
  • step ST33 it is determined whether or not the Y coordinate of the measured chromaticity is within the allowable white range shown in FIG. 6, and in step ST34, the X coordinate of the measured chromaticity is shown in FIG. It is determined whether it is within the white tolerance range shown. If a negative result is obtained in either step ST33 or step ST34, the process proceeds to step ST35, and the duty ratio is corrected by the duty ratio setting unit 34.
  • This correction of the duty ratio is performed based on which direction and how much the measured value deviates from the target point of the white balance.
  • the microcomputer 32 corrects the duty ratio of the PWM signal for each color LED in consideration of the chromaticity distribution range of each color LED. For example, if the amount of deviation is proportionally distributed to the duty ratio correction amount of each color LED in consideration of the chromaticity distribution range of each color LED, the duty ratio that can keep the white balance within the allowable range is small. With the number of corrections, you can find it quickly. For example, as shown in FIG.
  • the distribution range of the R, G, and B LEDs in the chromaticity space is generally as shown in Fig. 6, so the Y component of the white balance is made smaller and the X component is made larger to reach the target point. For example, the on-duty ratio for red is increased, and the on-duty ratio for green is decreased.
  • step ST33 If a positive result is obtained in both step ST33 and step ST34, the drive voltage measuring device 30 indicates that the white balance has entered the white color allowable range, so the drive voltage measuring device 30 proceeds to step ST36.
  • the duty ratio for red, green, and blue currently set in the duty ratio setting section 34 is stored in the corresponding duty ratio storage registers 21, 22, 23, and the following steps In ST37, the white balance adjustment processing ends.
  • the driving voltage setting device 30 measures the white balance of the actual display color, starting from the duty ratio that can obtain the desired luminance independently for each of the R, G, and B LEDs. While correcting the duty ratio for each color according to the measurement result, search for a duty ratio that can obtain the desired white balance, and search for the duty ratio for each color when the desired white 1 and balance are obtained.
  • the duty ratios are stored in the corresponding duty ratio storage registers 21, 22, 23.
  • the drive voltage setting device 30 adjusts the white balance by correcting the duty ratio for each color, so that the white balance can be finely and easily adjusted.
  • the duty ratio for adjusting the white balance is stored in the writable registers 21, 22, 23, so that the duty ratio unique to each product is actually stored. It is possible to write while measuring the chromaticity of each product, so that even if there is variation in the LED, light guide plate and LCD panel for each product, it is possible to obtain the desired white balance with each product .
  • the register selection circuit 15 selects the output of the R applied voltage storage register 11 from the output of the applied voltage storage registers 11, 12, and 13, and varies the voltage.
  • the circuit 18 forms a voltage of 2.2 V in accordance with the output of the R applied voltage storage register, and supplies this 2.2 V voltage to the LED unit 20 as shown in FIG.
  • the PWM signal of the duty ratio stored in the R duty ratio storage register 21 from the PWM waveform forming circuit 24 is output to the transistor 27.
  • the red LED emits light with the luminance according to the PWM signal.
  • the register selection circuit 15 is connected to the output of the R applied voltage storage register 11 by the register selection circuit 15. Alternatively, select and output the output of the G applied voltage storage register 12.
  • the LED driving device 10 forms a voltage of 3.3 V according to the data of the G applied voltage storage register 12 by the voltage variable circuit 18, and this 3.3 V Is supplied to the LED unit 20. Also, when the green LED emission timing signal TG rises at the time t4 in the green LED emission period LG, the PWM signal of the duty ratio stored in the G duty ratio storage register 22 from the PWM waveform forming circuit 25 is applied to the transistor 28. , The green LED emits light at a luminance corresponding to the PWM signal.
  • the LED driving device 10 forms a voltage of 3.4 V according to the data of the B applied voltage storage register 13 by the voltage variable circuit 18, and this 3.
  • a voltage of 4 V is supplied to the LED unit 20.
  • the PWM signal of the duty ratio stored in the duty ratio storage register for B 23 from the PWM waveform forming circuit 26 is output from the PWM waveform forming circuit 26. Is output to the transistor 29, so that the blue LED emits light at a luminance corresponding to the PWM signal.
  • the field sequential color display is performed.
  • the LED light emission period LR, LG, LB of each color is selected to be about 5 mS, and the PWM signal output period for each color is selected to be about 2000 ⁇ S.
  • the duty cycle of the PWM signal waveform in a unit cycle of 50 ⁇ S is stored in the duty cycle storage registers 21 to 23.
  • the duty ratio of 8 bits is stored in each of the duty ratio storage registers 21 to 23.
  • each of the red, green, and blue LEDs is independently illuminated within the unit light emission period while performing PWM control, and the chromaticity at that time is measured by the luminance / chromaticity meter 31.
  • the deviation of the measured value from the target white balance value is calculated, the duty ratio of each color LED is corrected according to the deviation, and the LEDs of each color are emitted again, when the deviation falls within a predetermined allowable range.
  • LED color deute By storing the power ratio in the duty ratio storage registers 21, 22, and 23, it is possible to easily and subtly adjust the white balance even if there are variations in the LED emission characteristics or the LCD panel 40. It is possible to realize a display device adjusting method and a display device that can be adjusted.
  • the LED unit 20 is composed of two red LEDs, a blue LED, and one green LED for the sake of simplicity of the drawing and the description.
  • the number of LEDs is not limited to this. Also, the number of LED units 20 may be any number, and the driving voltage and duty ratio of each color LED may be set independently for each LED unit and stored in the memory.
  • a variable voltage is applied independently to LEDs of the same color, the luminance is also detected independently for LEDs of the same color, and the minimum applied voltage when the luminance of each LED of the same color is higher than the desired value is detected.
  • the values may be independently set as drive voltage values, and the drive voltage values may be stored in the applied voltage storage registers 11 to 13, and each LED may be driven by the voltage value. In this way, even if there is a variation in the driving voltage required to obtain the desired luminance between the LEDs of the same color, each LED of the same color can be driven with the minimum driving voltage according to the variation. The current consumption can be further reduced.
  • each LED of the same color is controlled by a PWM signal having a different duty ratio, and each LED of the same color independently stores a duty ratio when a desired luminance and white balance are detected. 2323, and each LED is PW by this duty ratio. M control may be performed. In this way, even if there is a variation in the duty ratio required to obtain the desired brightness / white balance between the LEDs of the same color, each LED is controlled by the PWM control at a duty ratio according to the variation. As a result, finer adjustment of brightness and white balance can be performed.
  • the power described in the case where the present invention is applied to a field sequential type liquid crystal display device is not limited to this.
  • the present invention is not limited to this, and color display is performed using R, G, B three-color LEDs.
  • the present invention can be widely applied to display devices.
  • the case where a voltage independent for each color is applied to each color LED has been described.
  • the present invention is not limited to this, and the same effect can be obtained even when the same voltage is applied to each color LED. be able to.
  • One embodiment of the display device adjusting method of the present invention includes an LED light emitting step in which each of the red, green, and blue color LEDs is made to emit light while independently performing PWM control within a unit light emitting period, and the chromaticity at that time is measured. Measurement step to be performed, the target white value of the measured value obtained in the measurement step 1, the output step to calculate the deviation from the balance value, and the LED of each color in the LED emission step according to the deviation obtained in the calculation step About P
  • the light emission of each color LED in the unit light emission period is controlled by the PWM signal, and the duty ratio of the PWM signal of each color LED that can keep the white balance within an allowable range is stored in the storage means. Since the information is stored, even if there is a variation in each color LED due to individual differences, it is possible to easily perform display adjustment to keep the white balance within an allowable range.
  • the adjustment of the display device is performed in a state where an LCD panel is mounted on a front surface of an LED and the CD panel is driven.
  • the variations can be absorbed and the white balance can be kept within an allowable range.
  • the duty ratio of the PWM signal for each color LED is corrected in consideration of the chromaticity distribution range of each color LED.
  • a duty ratio that can keep the white balance within an allowable range can be quickly found with a small number of corrections. For example, considering the chromaticity distribution range of each color LED, the amount of deviation should be proportionally distributed to the duty ratio correction amount of each color LED.
  • the duty ratio is also corrected independently of the LED of the same color according to the deviation obtained in the calculating step, and in the duty ratio storing step, Independent LEDs should be stored for the same color LED.
  • the same color LED can be adjusted by an independent PWM signal, so that the white balance adjustment process can be performed one step more finely than when the same color LED is collectively controlled by the same PWM signal. Will be able to do it.
  • One embodiment of the display device of the present invention is a writable memory, in which a duty ratio for independently controlling each of the red, green, and blue LEDs in a unit light emission period is controlled independently for each color LED.
  • a signal line connected to the storage means.
  • One aspect of the display device of the present invention employs a configuration in which the duty ratio storage means stores a duty ratio subjected to white balance adjustment via a signal line.
  • the white balance can be finely and easily adjusted. Since the duty ratio of the PWM signal for each color LED is stored in the writable memory, the duty ratio suitable for the display device can be written at any time.
  • the duty ratio storage means stores an independent duty ratio for LEDs of the same color
  • the PWM control means outputs an independent PWM signal also for LEDs of the same color.
  • a configuration is adopted in which the LEDs of the same color are formed and controlled independently within the unit light emission period.
  • the LEDs of the same color are also controlled to emit light by independent PWM signals, so that a finer white balance display can be achieved.
  • the light emission of each color LED in the unit light emission period is controlled by the PWM signal, and the duty ratio of the PWM signal of each color LED is set so that the white balance can be kept within an allowable range. Since the information is stored in the storage means, even if the light emission characteristics of the LED and the LCD panel are not uniform, the display device can be adjusted easily and finely, and the balance can be adjusted. Can be realized.
  • the rough voltage adjustment is performed by storing the minimum voltage value when the luminance higher than the target is obtained for each color, and then the stored voltage is applied.
  • the white balance can be adjusted well and the current consumption can be reduced. It becomes like this.
  • the present specification is based on Japanese Patent Application No. 2003-98488 filed on April 1, 2003, the entire contents of which are incorporated herein. Industrial applicability
  • the present invention is suitably applied to, for example, a liquid crystal display device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Nonlinear Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)
  • Liquid Crystal (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

L'invention concerne des DELs rouges, vertes et bleues commandées de manière indépendante par modulation d'impulsions de durée, ce qui leur permet d'émettre leur lumière respective dans une période temporelle d'émission de lumière. Durant cette période, la température de la couleur est déterminée par un mètre (31) luminosité/ température de la couleur. Une déviation de la valeur déterminée à partir d'une valeur cible d'équilibre des blancs est calculée, et les taux d'utilisation des DELs sont corrigés selon la déviation. Puis, les DELs sont incitées de nouveau à émettre de la lumière, et lorsque la déviation atteint un seuil prédéterminé, les taux d'utilisation des DELs sont stockés dans des enregistreurs (21, 22, 23) de stockage des taux d'utilisation.
PCT/JP2004/004291 2003-04-01 2004-03-26 Procede pour ajuster un dispositif d'affichage et dispositif d'affichage Ceased WO2004090856A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP04723725A EP1562170B1 (fr) 2003-04-01 2004-03-26 Procede pour ajuster un dispositif d'affichage et dispositif d'affichage
US10/532,240 US20060152468A1 (en) 2003-04-01 2004-03-26 Display device adjusting method and display device
DE602004017832T DE602004017832D1 (de) 2003-04-01 2004-03-26 Anzeigebauelement-einstellverfahren und anzeigebauelement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003-098488 2003-04-01
JP2003098488A JP2004309509A (ja) 2003-04-01 2003-04-01 表示装置の調整方法

Publications (1)

Publication Number Publication Date
WO2004090856A1 true WO2004090856A1 (fr) 2004-10-21

Family

ID=33156673

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2004/004291 Ceased WO2004090856A1 (fr) 2003-04-01 2004-03-26 Procede pour ajuster un dispositif d'affichage et dispositif d'affichage

Country Status (9)

Country Link
US (1) US20060152468A1 (fr)
EP (1) EP1562170B1 (fr)
JP (1) JP2004309509A (fr)
KR (1) KR100676238B1 (fr)
CN (1) CN1701350A (fr)
AT (1) ATE414973T1 (fr)
DE (1) DE602004017832D1 (fr)
TW (1) TW200424996A (fr)
WO (1) WO2004090856A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005020568A1 (de) * 2005-04-30 2006-11-09 Osram Opto Semiconductors Gmbh Lichtquellenanordnung zur Hinterleuchtung von Anzeigevorrichtungen sowie Anzeigevorrichtung
US7701427B2 (en) * 2005-06-10 2010-04-20 Seiko Epson Corporation Display panel module, display unit, inspection device for display panel and inspection method for display panel
WO2015100769A1 (fr) * 2013-12-31 2015-07-09 深圳市华星光电技术有限公司 Procédé et système de réglage de balance des blancs, et procédé de fabrication de dispositif d'affichage à cristaux liquides

Families Citing this family (62)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7139595B2 (en) * 2002-10-24 2006-11-21 The Rail Network, Inc. Transit vehicle wireless transmission broadcast system
WO2004090997A1 (fr) * 2003-04-01 2004-10-21 Hunet Inc. Dispositif et procede d'excitation de diodes electroluminescentes
KR100659531B1 (ko) 2003-11-27 2006-12-19 삼성에스디아이 주식회사 백라이트 구동회로
KR100985858B1 (ko) 2004-04-27 2010-10-08 삼성전자주식회사 액정표시장치
JP2005321727A (ja) * 2004-05-11 2005-11-17 Sony Corp バックライト装置及びカラー液晶表示装置
TWI261692B (en) * 2004-07-15 2006-09-11 Sony Corp Color filter and color liquid crystal display device
JP4815781B2 (ja) * 2004-10-20 2011-11-16 ソニー株式会社 カラー液晶表示装置及びバックライト装置
KR100713889B1 (ko) * 2004-12-22 2007-05-04 비오이 하이디스 테크놀로지 주식회사 백 라이트 구동 회로
KR100752376B1 (ko) 2005-02-22 2007-08-27 삼성에스디아이 주식회사 백라이트 구동회로 및 이를 구비한 액정 표시 장치
KR100714427B1 (ko) * 2005-10-12 2007-05-07 삼성전자주식회사 디스플레이장치 및 그 제어방법
JP2007141738A (ja) * 2005-11-21 2007-06-07 Sharp Corp 照明装置、液晶表示装置、照明装置の制御方法、照明装置制御プログラム、および記録媒体
KR200416914Y1 (ko) * 2006-02-22 2006-05-23 김두일 고분자 유기 발광 디스플레이를 제어하기 위한 드라이버
JP2007235050A (ja) * 2006-03-03 2007-09-13 Sony Corp 面状光源装置の駆動方法、カラー液晶表示装置組立体の駆動方法、発光ダイオードの駆動方法、及び、パルス幅変調方法
TWI371013B (en) 2006-03-29 2012-08-21 Au Optronics Corp Liquid crystal device, method for displaying color images, and method for controlling light sources of a liquid crystal panel
KR100691628B1 (ko) * 2006-04-07 2007-03-12 삼성전기주식회사 Ｌｅｄ 어레이 구동 장치
CN100552765C (zh) * 2006-04-25 2009-10-21 友达光电股份有限公司 液晶显示器及彩色图像的显示方法及控制光源的方法
JP4182989B2 (ja) * 2006-05-30 2008-11-19 ソニー株式会社 照明装置および液晶表示装置
US7696964B2 (en) * 2006-06-09 2010-04-13 Philips Lumileds Lighting Company, Llc LED backlight for LCD with color uniformity recalibration over lifetime
JP2008076899A (ja) * 2006-09-22 2008-04-03 Sony Corp バックライト装置及び表示装置
US8373355B2 (en) * 2006-11-09 2013-02-12 Apple Inc. Brightness control of a status indicator light
CN101460986B (zh) * 2006-11-29 2011-11-16 松下电器产业株式会社 视频显示装置、视频显示方法
JP4839379B2 (ja) * 2006-11-29 2011-12-21 シャープ株式会社 バックライト装置、及びこれを用いた表示装置
JP4285532B2 (ja) * 2006-12-01 2009-06-24 ソニー株式会社 バックライト制御装置、バックライト制御方法、および液晶表示装置
KR101370339B1 (ko) 2006-12-04 2014-03-05 삼성전자 주식회사 백라이트장치 및 그 제어방법
KR100831871B1 (ko) * 2006-12-05 2008-05-22 엘지이노텍 주식회사 Ｌｅｄ 백라이트 제어 회로
JP2008158454A (ja) * 2006-12-26 2008-07-10 Sony Corp 液晶表示装置
JP4264560B2 (ja) * 2007-01-24 2009-05-20 ソニー株式会社 バックライト装置、バックライト制御方法、および液晶表示装置
KR101385453B1 (ko) * 2007-05-02 2014-04-21 삼성디스플레이 주식회사 광원의 구동방법 및 이를 수행하기 위한 백라이트 어셈블리
US8044899B2 (en) * 2007-06-27 2011-10-25 Hong Kong Applied Science and Technology Research Institute Company Limited Methods and apparatus for backlight calibration
JP2009020385A (ja) * 2007-07-13 2009-01-29 Seiko Epson Corp 電気光学装置、その制御方法および電子機器
KR101443371B1 (ko) * 2007-07-13 2014-09-29 엘지디스플레이 주식회사 액정표시장치 및 그의 구동방법
JP4455620B2 (ja) 2007-07-17 2010-04-21 東芝モバイルディスプレイ株式会社 表示装置の製造方法及び色バランス調整方法
KR101503309B1 (ko) * 2007-12-06 2015-03-17 엘지디스플레이 주식회사 백라이트 유닛의 색보정 장치
JP2009168927A (ja) * 2008-01-11 2009-07-30 Hitachi Displays Ltd 有機ｅｌ表示装置
KR101511127B1 (ko) * 2008-01-22 2015-04-10 삼성디스플레이 주식회사 광원 구동 방법, 광원 구동 장치 및 이를 갖는 표시장치
JP5642347B2 (ja) * 2008-03-07 2014-12-17 ミツミ電機株式会社 液晶バックライト装置
JPWO2009116637A1 (ja) * 2008-03-19 2011-07-21 旭硝子株式会社 被観察物からの光透過機能を有する画像表示装置
DE102008018808A1 (de) * 2008-04-15 2009-10-22 Ledon Lighting Jennersdorf Gmbh Mikrocontroller optimierte Pulsweitenmodulation-(PWM)-Ansteuerung einer Licht emittierenden Diode(LED)
JP2009276672A (ja) * 2008-05-16 2009-11-26 Canon Inc 表示装置
KR101573434B1 (ko) 2008-12-02 2015-12-02 삼성디스플레이 주식회사 광원 구동 방법, 이를 수행하기 위한 광원 장치 및 이 광원장치를 갖는 표시 장치
TWI406229B (zh) * 2008-12-16 2013-08-21 Chunghwa Picture Tubes Ltd 以色序法顯色之光源裝置
CN101860764B (zh) * 2009-04-08 2012-07-18 鸿富锦精密工业（深圳）有限公司 白平衡调整方法
KR101349514B1 (ko) * 2009-06-03 2014-01-08 미쓰비시덴키 가부시키가이샤 화상 표시 장치
CN102034441B (zh) * 2009-09-29 2013-05-08 深圳Tcl新技术有限公司 一种lcd驱动电压控制装置
KR20110057456A (ko) * 2009-11-24 2011-06-01 삼성전자주식회사 디스플레이 장치 및 백라이트 유닛
TWI465152B (zh) * 2010-06-28 2014-12-11 Hon Hai Prec Ind Co Ltd 可控制電流均衡的led顯示裝置及其控制方法
CN102014554B (zh) * 2010-09-28 2013-07-10 深圳市明微电子股份有限公司 驱动电流的调节方法及调节装置
CN101996585A (zh) * 2010-11-03 2011-03-30 中航华东光电有限公司 基于rgb三基色led背光灯的自动白平衡调整系统和方法
CN102646395B (zh) * 2012-04-27 2015-06-10 京东方科技集团股份有限公司 直下式背光源控制装置及控制方法
TWI467550B (zh) * 2012-08-15 2015-01-01 Novatek Microelectronics Corp 背光模組及其驅動方法
CN103594062A (zh) * 2012-08-17 2014-02-19 联咏科技股份有限公司 背光模块及其驱动方法
CN103021379B (zh) * 2012-12-25 2015-10-07 广东威创视讯科技股份有限公司 基于定制光源占空比的颜色校正方法和系统
JP6322440B2 (ja) * 2013-03-06 2018-05-09 矢崎総業株式会社 色制御方法
DE102013220397A1 (de) * 2013-10-10 2015-04-16 Ruling Technologies Sdn. Bhd. Verfahren und Steuergerät zum Betreiben zumindest einer Lichtquelle
KR102106271B1 (ko) 2013-10-24 2020-05-06 삼성디스플레이 주식회사 표시 장치 및 그것의 구동 방법
CN104766574B (zh) * 2015-03-24 2019-02-12 小米科技有限责任公司 色温调节方法及装置
KR20200057256A (ko) * 2018-11-16 2020-05-26 삼성전자주식회사 디스플레이 장치 및 그 구동 방법
CN110379375B (zh) * 2019-06-25 2021-05-07 深圳市金锐显数码科技有限公司 背光电流档位的自动切换方法和自动切换系统
CN111800916A (zh) * 2020-06-24 2020-10-20 苏州浪潮智能科技有限公司 一种数据中心交换机端口灯颜色校准系统及方法
US11835382B2 (en) 2021-03-02 2023-12-05 Apple Inc. Handheld electronic device
US12355907B2 (en) 2022-01-10 2025-07-08 Apple Inc. Handheld electronic device
KR20240054430A (ko) * 2022-10-18 2024-04-26 삼성디스플레이 주식회사 표시 장치의 휘도 보상 방법

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09292601A (ja) * 1996-04-25 1997-11-11 Kansei Corp 液晶表示装置
JP2000111871A (ja) * 1998-10-02 2000-04-21 Canon Inc カラー液晶表示装置
JP2002117999A (ja) * 2000-10-11 2002-04-19 Sanyo Electric Co Ltd ライト調光装置及びこれを用いた液晶表示装置
JP2003029235A (ja) * 2001-07-17 2003-01-29 Dainippon Printing Co Ltd フィールドシーケンシャル型液晶ディスプレイ
JP2004086081A (ja) * 2002-08-29 2004-03-18 Citizen Electronics Co Ltd カラー表示装置およびカラー表示装置の白色バランス調整方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5724062A (en) * 1992-08-05 1998-03-03 Cree Research, Inc. High resolution, high brightness light emitting diode display and method and producing the same
JP4050802B2 (ja) * 1996-08-02 2008-02-20 シチズン電子株式会社 カラー表示装置
US6342897B1 (en) * 1999-12-16 2002-01-29 Dynascan Technology Corporation Method and system for compensating for non-uniform color appearance of a display due to variations of primary colors
FI109632B (fi) * 2000-11-06 2002-09-13 Nokia Corp Valkoinen valaisu
US7088334B2 (en) * 2001-06-28 2006-08-08 Matsushita Electric Industrial Co., Ltd. Liquid crystal display device and manufacturing method thereof, and drive control method of lighting unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09292601A (ja) * 1996-04-25 1997-11-11 Kansei Corp 液晶表示装置
JP2000111871A (ja) * 1998-10-02 2000-04-21 Canon Inc カラー液晶表示装置
JP2002117999A (ja) * 2000-10-11 2002-04-19 Sanyo Electric Co Ltd ライト調光装置及びこれを用いた液晶表示装置
JP2003029235A (ja) * 2001-07-17 2003-01-29 Dainippon Printing Co Ltd フィールドシーケンシャル型液晶ディスプレイ
JP2004086081A (ja) * 2002-08-29 2004-03-18 Citizen Electronics Co Ltd カラー表示装置およびカラー表示装置の白色バランス調整方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005020568A1 (de) * 2005-04-30 2006-11-09 Osram Opto Semiconductors Gmbh Lichtquellenanordnung zur Hinterleuchtung von Anzeigevorrichtungen sowie Anzeigevorrichtung
US7701427B2 (en) * 2005-06-10 2010-04-20 Seiko Epson Corporation Display panel module, display unit, inspection device for display panel and inspection method for display panel
WO2015100769A1 (fr) * 2013-12-31 2015-07-09 深圳市华星光电技术有限公司 Procédé et système de réglage de balance des blancs, et procédé de fabrication de dispositif d'affichage à cristaux liquides

Also Published As

Publication number Publication date
KR20060030847A (ko) 2006-04-11
JP2004309509A (ja) 2004-11-04
ATE414973T1 (de) 2008-12-15
US20060152468A1 (en) 2006-07-13
KR100676238B1 (ko) 2007-01-30
CN1701350A (zh) 2005-11-23
EP1562170B1 (fr) 2008-11-19
DE602004017832D1 (de) 2009-01-02
EP1562170A1 (fr) 2005-08-10
EP1562170A4 (fr) 2005-12-07
TW200424996A (en) 2004-11-16
TWI295045B (fr) 2008-03-21

Similar Documents

Publication Publication Date Title
WO2004090856A1 (fr) Procede pour ajuster un dispositif d'affichage et dispositif d'affichage
WO2004090997A1 (fr) Dispositif et procede d'excitation de diodes electroluminescentes
US20080180381A1 (en) Pulse width modulation dimming control method and display apparatus having pulse width modulation dimming control function
US20070159434A1 (en) Driving system of light emitting diode
JP2009016104A (ja) 制御装置および制御方法、並びに、面状光源および面状光源の制御方法
TW201325306A (zh) 控制ｌｅｄ亮度的調光控制器及方法
JP4076083B2 (ja) Ｌｅｄの駆動電圧設定装置及びその方法
JP2009188135A (ja) Ｌｅｄドライバおよび電子機器
JP2008170768A (ja) 画像表示装置及び方法並びにプロジェクタ
US8076858B2 (en) Light sensing apparatus and method for luminaire calibration
JP4015965B2 (ja) Ｌｅｄ駆動装置及びｌｅｄ駆動方法
JP2005184020A (ja) Ｌｅｄ駆動装置及びｌｅｄ駆動方法
KR101423112B1 (ko) 광 발생장치, 이를 갖는 표시장치 및 그 구동방법
JP2004309510A (ja) Ｌｅｄ駆動装置及びｌｅｄ駆動方法
TWI745024B (zh) 脈衝寬度調變信號產生電路、源極驅動晶片、及ｌｅｄ顯示裝置
KR101676245B1 (ko) 액정 표시장치 및 그의 구동방법
JP4516507B2 (ja) 液晶表示装置
KR20060048486A (ko) 컬러 표시 장치, 및 이를 위한 반도체 장치
HK1083274B (en) Led drive device
JP2007134194A (ja) 発光素子制御装置、発光素子バックライト装置、液晶表示装置、及びホワイトバランス制御方法
KR20090054581A (ko) Ｌｅｄ 구동회로와 이를 이용한 백 라이트 유닛 및 액정표시장치
HK1083263A (en) Display device adjusting method and display device
KR100958357B1 (ko) 엘이디 백라이트 시스템 및 그 구동 방법
CN119314437A (zh) 背光像素驱动电路和显示装置
JP2006276379A (ja) 照明装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 20048011212

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 1020057007217

Country of ref document: KR

WWE Wipo information: entry into national phase

Ref document number: 2004723725

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2060/DELNP/2005

Country of ref document: IN

WWP Wipo information: published in national office

Ref document number: 2004723725

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2006152468

Country of ref document: US

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 10532240

Country of ref document: US

WWP Wipo information: published in national office

Ref document number: 1020057007217

Country of ref document: KR

WWP Wipo information: published in national office

Ref document number: 10532240

Country of ref document: US